u-boot/arch/arm/lib/interrupts.c
Lothar Waßmann c88823612d arm: adjust PC displayed in exception handlers to point to the failing instruction
Adjust the program counter register to point to the failing
instruction depending on the exeption type.
This makes it easier to localize the offending instruction leading to
a fatal exception.

Signed-off-by: Lothar Waßmann <LW@KARO-electronics.de>
2017-06-12 08:38:39 -04:00

164 lines
3.8 KiB
C

/*
* (C) Copyright 2003
* Texas Instruments <www.ti.com>
*
* (C) Copyright 2002
* Sysgo Real-Time Solutions, GmbH <www.elinos.com>
* Marius Groeger <mgroeger@sysgo.de>
*
* (C) Copyright 2002
* Sysgo Real-Time Solutions, GmbH <www.elinos.com>
* Alex Zuepke <azu@sysgo.de>
*
* (C) Copyright 2002-2004
* Gary Jennejohn, DENX Software Engineering, <garyj@denx.de>
*
* (C) Copyright 2004
* Philippe Robin, ARM Ltd. <philippe.robin@arm.com>
*
* SPDX-License-Identifier: GPL-2.0+
*/
#include <common.h>
#include <asm/proc-armv/ptrace.h>
#include <asm/u-boot-arm.h>
#include <efi_loader.h>
DECLARE_GLOBAL_DATA_PTR;
int interrupt_init (void)
{
/*
* setup up stacks if necessary
*/
IRQ_STACK_START_IN = gd->irq_sp + 8;
return 0;
}
void enable_interrupts (void)
{
return;
}
int disable_interrupts (void)
{
return 0;
}
void bad_mode (void)
{
panic ("Resetting CPU ...\n");
reset_cpu (0);
}
void show_regs (struct pt_regs *regs)
{
unsigned long __maybe_unused flags;
const char __maybe_unused *processor_modes[] = {
"USER_26", "FIQ_26", "IRQ_26", "SVC_26",
"UK4_26", "UK5_26", "UK6_26", "UK7_26",
"UK8_26", "UK9_26", "UK10_26", "UK11_26",
"UK12_26", "UK13_26", "UK14_26", "UK15_26",
"USER_32", "FIQ_32", "IRQ_32", "SVC_32",
"UK4_32", "UK5_32", "UK6_32", "ABT_32",
"UK8_32", "UK9_32", "HYP_32", "UND_32",
"UK12_32", "UK13_32", "UK14_32", "SYS_32",
};
flags = condition_codes (regs);
printf("pc : [<%08lx>] lr : [<%08lx>]\n",
instruction_pointer(regs), regs->ARM_lr);
if (gd->flags & GD_FLG_RELOC) {
printf("reloc pc : [<%08lx>] lr : [<%08lx>]\n",
instruction_pointer(regs) - gd->reloc_off,
regs->ARM_lr - gd->reloc_off);
}
printf("sp : %08lx ip : %08lx fp : %08lx\n",
regs->ARM_sp, regs->ARM_ip, regs->ARM_fp);
printf ("r10: %08lx r9 : %08lx r8 : %08lx\n",
regs->ARM_r10, regs->ARM_r9, regs->ARM_r8);
printf ("r7 : %08lx r6 : %08lx r5 : %08lx r4 : %08lx\n",
regs->ARM_r7, regs->ARM_r6, regs->ARM_r5, regs->ARM_r4);
printf ("r3 : %08lx r2 : %08lx r1 : %08lx r0 : %08lx\n",
regs->ARM_r3, regs->ARM_r2, regs->ARM_r1, regs->ARM_r0);
printf ("Flags: %c%c%c%c",
flags & CC_N_BIT ? 'N' : 'n',
flags & CC_Z_BIT ? 'Z' : 'z',
flags & CC_C_BIT ? 'C' : 'c', flags & CC_V_BIT ? 'V' : 'v');
printf (" IRQs %s FIQs %s Mode %s%s\n",
interrupts_enabled (regs) ? "on" : "off",
fast_interrupts_enabled (regs) ? "on" : "off",
processor_modes[processor_mode (regs)],
thumb_mode (regs) ? " (T)" : "");
}
/* fixup PC to point to the instruction leading to the exception */
static inline void fixup_pc(struct pt_regs *regs, int offset)
{
uint32_t pc = instruction_pointer(regs) + offset;
regs->ARM_pc = pc | (regs->ARM_pc & PCMASK);
}
void do_undefined_instruction (struct pt_regs *pt_regs)
{
efi_restore_gd();
printf ("undefined instruction\n");
fixup_pc(pt_regs, -4);
show_regs (pt_regs);
bad_mode ();
}
void do_software_interrupt (struct pt_regs *pt_regs)
{
efi_restore_gd();
printf ("software interrupt\n");
fixup_pc(pt_regs, -4);
show_regs (pt_regs);
bad_mode ();
}
void do_prefetch_abort (struct pt_regs *pt_regs)
{
efi_restore_gd();
printf ("prefetch abort\n");
fixup_pc(pt_regs, -8);
show_regs (pt_regs);
bad_mode ();
}
void do_data_abort (struct pt_regs *pt_regs)
{
efi_restore_gd();
printf ("data abort\n");
fixup_pc(pt_regs, -8);
show_regs (pt_regs);
bad_mode ();
}
void do_not_used (struct pt_regs *pt_regs)
{
efi_restore_gd();
printf ("not used\n");
fixup_pc(pt_regs, -8);
show_regs (pt_regs);
bad_mode ();
}
void do_fiq (struct pt_regs *pt_regs)
{
efi_restore_gd();
printf ("fast interrupt request\n");
fixup_pc(pt_regs, -8);
show_regs (pt_regs);
bad_mode ();
}
void do_irq (struct pt_regs *pt_regs)
{
efi_restore_gd();
printf ("interrupt request\n");
fixup_pc(pt_regs, -8);
show_regs (pt_regs);
bad_mode ();
}